Nitro Survey

[[email protected]]

50% RedMax...........

 

[westoz]

40%/ 20%klotz 90cmb

 

[shoboat]

I run 65% O'Donnell fuel or 68 to 70 % homemade fuel with a full

synethic oil mix. It has worked well for 16 years why change now?

.21 motors of course,the fastest boats in a time trial.

Most of the speed is in the propeller fellas,not the fuel. :lol: :lol: :lol:

Thanks,

Mark Sholund

 

[bsmtboy2]

Redmax 65% in my cmb45's they seem to perform best with 18% oil,cmb67 uses55% with 18% oil.

 

[BradV]

Thanks guys, I think this time around I will go straight to 50% for the 1.0 CMB after a run in on 20%.

Seems the Redmax fuels are the way to go. Not sure if I can get it locally. I wonder what additive they use...?

 

[Pennywizz6]

How much does a gallon of 60 or 65 cost?

Phil <_<

 

[BradV]

Yeah I can't get Redmax or O'Donnel racing fuels locally, so I will chase up a custom blend.

18% Oil 15/3 Castrol/Klotz

50% nitro

Would love to know some details of any additives you guys know about..

 

[westoz]

Hi Brad just a thought maybe idea to run in with fuel you intend to use all the time if you run in with 20% then jump to 50% you will have to basically run it in again.

any thoughts.

Dave.

 

[davo]

how much power increase is there in running 15% compared to 25-30%?

 

[BradV]

Hi Brad just a thought maybe idea to run in with fuel you intend to use all the time if you run in with 20% then jump to 50% you will have to basically run it in again.any thoughts.

Dave.

I didn't think any motor liked initial run-in on 50% nitro. Maybe the CMB's like it. I don't know. Any other opinions?

 

[androdz]

Better question is how much you guys pay for your nitro fuel. Im running 87 octane gas in the 60's with my cat. on a zenoah 260 :lol: .

PS: may I add only 42.9 a liter thus $1.62 a gal

Att. Andrew

 

[BradV]

Ha speed -vse- economy!

Give me speed any day.

 

[Don Ferrette]

Hi Brad just a thought maybe idea to run in with fuel you intend to use all the time if you run in with 20% then jump to 50% you will have to basically run it in again.any thoughts.

Dave.

I didn't think any motor liked initial run-in on 50% nitro. Maybe the CMB's like it. I don't know. Any other opinions?

I've always broken motors in on the fuel I'm going to run in them racing. B)

 

[BradV]

After just doing some calculations and thinking about fuel mixes I can see why the higher the nitro content the less % oil you need as nitro is not the combusted propulsion liquid and the methanol is.

So I can see that aiming to keep the methanol % at an optimum point is where a fuels power will come from, of course factoring into the effect of nitro as well.

Another explanation is if you keep the % oil the same (eg 20%) for 20%, 30%, 40%, 50%, 60% nitro you end up getting less and less methanol to work with, which would limit the fuels potential.

So by lowering the oil content to 15% as some have suggested gives you back more methanol.

Don do you have any issues with running 15% oil, and has anyone gone lower than this with higher nitro blends on bigger motors?

Another question, I always have been told to keep a little bit of non-synthetic oil such as "castrol m" in all fuels - approx 5%. Any opinions and suggestions whether this is needed with todays synthetics?

 

[Lake S.P.O.R.T.]

"I am running 87 octane gas in the 60's with my cat on a zenoah 260"

Well Andrew the thing is the gas boaters here in the states are running racing fuel or AV gas. Such fuels are not $1.62 per gallon.

 

[bzubee]

I mix my own at 70% for .21's and 50% for all others with 18% synthetic/caster mix. No probelms I had a bearing go ur just be fore the Internats but it hadn't been changed since 1999.

 

[[email protected]]

How much does a gallon of 60 or 65 cost?
Phil <_<

I've paid between $25 and $32 for one gallon.

 

[topfuel443]

unfortunately, we pay 32$ for a gallon of 60% redmax at our local hobby shop....not much of a bargain. One day when im rich, im gonna just buy a couple cases from the manufacturer....seeing is how FHS is in S.C. (my homestate)

~James

 

[dave roach]

Topfuel

Why not mix your own fuel. I have been mixing fuel for 10 years and for 60% it:s about 17.00 dollars a gallon.

 

[topfuel443]

I really should actually, we have about 20 gallons of nitro left from our topfuel dragbike days....wonder if its still good?

anybody feel like sharing there fuel mixing specs?

~James